SCC）。使用獨立設(shè)計的慢應(yīng)變率拉伸（SSRT）系統(tǒng)在沸騰的硝酸中獲得應(yīng)變率為10-5 s-1的Zr702的應(yīng)力-應(yīng)變曲線。進(jìn)行微觀表征以及數(shù)值分析以量化Zr702的SCC行為。結(jié)果表明，隨著HNO3濃度的增加，Zr702的ISCC由5%明顯增加到26.67%。商用Zr702在沸騰HNO3溶液中力學(xué)性能的急劇下降歸因于試樣表面的解理斷裂，并且解理裂紋的深度隨著HNO3濃度的增加而增加。最后，提出了預(yù)測商業(yè)Zr702在沸騰HNO3溶液中SCC行為的模型和方程。HNO3濃度、ISCC、斷裂應(yīng)力（σSCC）和解理裂紋深度（dcc）之間的定量關(guān)系可以使用高階回歸方程來描述和預(yù)測。;The stress corrosion cracking (SCC) and its susceptibility (ISCC) of commercial Zr702 applied for spent nuclear fuel reprocessing industry was investigated in boiling nitric acid. Stress-strain curves of Zr702 in boiling nitric acid with strain rate of 10-5 s-1 were obtained using independent designed slow strain rate tension (SSRT) system. Microscopic characterizations as well as numerical analysis were carried out to quantify the SCC behavior of Zr702. Results reveal that the ISCC of Zr702 obviously increases from 5% to 26.67% with the increase in HNO3 concentration. The sharp decline in the mechanical properties of commercial Zr702 in boiling HNO3 solutions is attributed to cleavage fracture on surfaces of specimen, and the depth of the cleavage cracks increases with the growing HNO3 concentration. Finally, a model and an equation to predict the SCC behavior of commercial Zr702 in boiling HNO3 solutions was proposed. The quantitative relationship among HNO3 concentration, ISCC, fracture stress (σSCC) and cleavage crack depth (dcc) can be described and predicted using a high-order regression equation."/>